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PR27952, Disallow ET_DYN DF_1_PIE linker input

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This patch adds a new elf_tdata flag, is_pie, set during the linker's
open_input_bfds processing.  The flag is then used to reject attempts
to link a PIE as if it were a shared library.

bfd/
	PR 27952
	* elf-bfd.h (struct elf_obj_tdata): Add is_pie.
	* elflink.c (elf_link_add_object_symbols): Set is_pie.
ld/
	PR 27952
	* ldelf.c (ldelf_after_open): Error on input PIEs too.
This commit is contained in:
Alan Modra
2021-06-11 14:06:47 +09:30
parent 860cc54cd4
commit f64b9b13ce
5 changed files with 19 additions and 1 deletions
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2
bfd/elflink.c
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@ -4349,6 +4349,8 @@ elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
unsigned int tagv = dyn.d_un.d_val;
audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
}
if (dyn.d_tag == DT_FLAGS_1)
elf_tdata (abfd)->is_pie = (dyn.d_un.d_val & DF_1_PIE) != 0;
}
free (dynbuf);